Locomotive boiler



April 15, 1930.

A. W. NELSON LOCOMOTIVE BOILER Filed June 18, 1928 3 Sheets-Sheet 1 5Sheets-Sheet 2 Filed June 18, 1928 mm W NW m IIIILIII l filllkllil April15, 1930. v w, NELSQN 1,754,761

I LOCOMOTIVE BOILER Filed June 18, 1928 3 Sheets-Sheet 5 Patented Apr.15, 1930 UN] TED STATES P ATE NT OFFICE ARTHUR WM. NELSON, 'OF PARKRIDGE, ILLINOIS, ASSIGNOR TO LOCOMOTIVE FIRE- BOX COMPANY, OF CHICAGO,ILLINOIS, A CORPORATION OF DELAWARE LOGOMOTIVE BOILER Application filedJune '18, 1928.

This invention relates to improvements in locomotive boilers andespecially to those having that type of firebox wherein fuel such oil isburned and it consists of the matters hereinafter described and moreparticular] pointed out in the appended claims. One of the objects ofthe present invention is to provide in a boiler of this kind, a pair offlat tubular water walls in the firebox 1 thereof, which are connectedat their inner rear corners with the boiler barrel and at their outerfront corners with the crown sheet of the firebox, whereby a largersuperficial heating area is provided and the water steaming andcirculating efficiencies of the boiler are materially increased.

The above mentioned objects as well as others, together with the manyadvantages thereof will more fully appear as I proceed 20. with myspecification.

In the drawings Fig. 1 is a longitudinal vertical sectional view throughthe firebox end of a locomotive boiler embodying my invention.

Fig. 2 isahorizontal sectional view through the same as taken on theline 2-9. of Fig. l with the firebriclr, burner and associated partsomitted to better disclose the construction and arrangement of the waterheating 2e and circulating elements.

Fig. 3 is a transverse vertical sectional view through the firebox endof the locomotive boiler as taken on the line 3-3 of Fig. 1.

Figs. 4 and 5 are transverse vertical detail sectional views throughparts of the boiler and firebox onan enlarged scale as taken. on thelines. H and 55 respectively of Fig. 1.

Referring now in detail 'to that emb0diment of the invention,illustrated in the accompanying, drawings, 1 indicates as a wholethebarrel ofthe boiler in which are arranged the usual times 2. Thefirebox of the boiler is formed by the flue sheet 3, rear sheet 4,

, side sheets .5 5 and crown sheet '6, all connec'ted together. in themanner well known.

In this instance the bottom portion 3 of the flue sheet forms the throatsheet of theiire 50' box. y Y v I i Serial No. 286,444.

The firebox wrapper comprises the top plate 7,theside plates 88, theoutside throat plate 9 and outside back plate 10. The wrapper justdescribed, together with the fire box sheets before mentioned, definethe several water legs of the boiler, i. e., the side legs 1111, thefront leg or throat 1 2, and back leg 13 all closed at the bottom by theusual mud ring 14. The firebox sheets are joined to the wrapper platesby means of stay bolts 15 in the manner well known. '16 indicates a dooropening which is normally closed by a door not shown), and this openingprovides the fuel door Opening in 'case the firebox is converted into acoal burner as is sometimes necessary and which conversion may bereadily made with but comparatively small expense.

In the middle bottom portion of the firebox is provided a novelarrangement of parts forming the water steaming and circulating elementsor means, indicated as a whole by the numeral 17 in Fig. 2. Said meanscomprises a pair of laterally spaced fiat hollow elements or walls 18-18which are disposed, one along the bottom portion of each side water legand said walls extend downward-1y and inwardly therefrom so as to bespaced apart equally on each side of the median line of the firebox.

Each element is in the form of a flat tube or body of a length greaterthan its width and of a suitable depth, open along its bottom marginalside and closed along its top marginal side by a bulged tubular portion19. This portion is closed at its rear end but extends forwardly beyondthe body to form a flanged discharge neck20 at said end. The open bottommarginal side of the body is de- "fined by an outwardly flaring flange21 'as iat said elements may amply resist the internal pressures towhich they aresnbj'ectedin use, they are stay-bolted as "indicated at22.

Associated with the bottom open side of each element body is a tribe 23which is also closed at its rear end but extends forwardly beyondthebody to form a flanged intake neck 24; The flange 21 of theassociated body seats snuglya ong one side of said tube and best shownin Figs. 4 and 5 and so t is welded thereto and in the rear end of thetube, in line with the open bottom of the body is an opening 25 as bestshown in Figs. 1 and 4. To support said elements in proper position inthe firebox, I affix to the firebox side sheets 55 shortly above the mudring, angle bars 26-26 upon which the top bulged portions 19 of eachelement engages so as to be spaced from the associated side sheet; thespace between said side sheets and bulged portions being filled with asuitable refractory material 27. The tubes 2323 associated with thebodies of said elements rest upon longitudinally spaced straps 2S28which are fixed at their ends to the side parts of the mud ring and thespace between said tubes are bridged by a brick arch 29, in which is anopening 30 to provide that amount of air necessary for the burning offuel in suspension within the firebox.

The inlet tube for each element is connected with the bottom of theboiler barrel by a conduit 31 and to facilitate assembly and to reducecost of manufacture I preferably make said conduit in more than onesection. As best shown in 1, said conduit comprises a substantiallystraight tubular section 32 which is fixed at one end to an as sociatedneck 24 and passes beneath the front portion of the mud ring, and anelbow section 33 which is fixed at one end to said section 32 and curvesupwardly to be connected to the barrel of the boiler at a point well inadvance of the front water leg 12.

Preferably said tubular and elbow sections are flanged as shown forattachment, the one to the other.

The front end extension 20 of each top bulged portion is connected toone of the firebox sheets and preferably with the crown sheet by anupright riser or stand-pipe 3 1. The bottom end of each riser is madewith an integral flanged elbow 35 which is fixed to the associatedflanged neck 20 while the top end of each riser is fixed in a flexiblediais closed off by a flash wall. 38. both walls being made offirebrick. In the front or burner wall is located a fuel nozzle 39 ofthe oil burner type which projects through an opening 40 in said wall.

In operation, the intense heat from the fuel burning in suspension inthe firebox over the elements, causes a rapid absorption of heat by theupper surfaces thereof, which heat in turn is taken up by the water insaid elements, thus converting part into steam. By

reason thereof, a rapid flow of water from the forward portion of theboiler barrel into the conduits 31 takes place and from there into thetubes 23. This water passes through the opening 25 in the rear end ofeach tube into the body 18 of each element where it is widelydistributed to receive the heat from the products of combustion to bedischarged from the diagonally opposite corner thereof,

up through the associated riser 34 and then into the boiler water spaceabove the firebox. As the risers or stand-pipes in themselves present alarge superficial area to the products of combustion in the firebox, afurther heating and steaming action is imparted to the water whichaugments that action produced in the element bodies. Thus the risers actas siphon-like pumps which assist in the lift of the water so thatcirculation is increased and as these stand-pipes discharge through thecrown sheet near its forward end, it is assured that said end of thecrown sheet is always flooded with water, even though the boiler waterlevel falls below the normal level. Such water discharged from thestand-pipes being extremely hot will flow forwardly due to the intakefrom the barrel into the conduits 31 so that the circulation isaccelerated and quiet areas within the boiler which makes possible thecollection of sediment are eliminated.

The parts are all confined to such dimensions as to make theirinstallation in a locomotive firebox practical and economical and theydo not interfere with the numerous other parts of the locomotive.Furthermore, the parts are so disposed in the firebox that they are notsubjected to such wide differences in temperatures as will cause them tobe seriously affected by resulting strains and stresses.

As is apparent the construction described readily lends itself forcomplete removal from the firebox when it is desired to convert the sameinto a coal burner.

In describing the invention, I have referred in detail to the form,arrangement and coustruction of the various parts thereof, the same isintended merely by way of illustration so that I do not wish to belimited thereto except as may be specifically set forth in the appendedclaims.

I claim as my invention:

1. A locomotive boiler construction embodying therein a barrel and afirebox having sheets forming parts of the front, rear and side waterlegs of the boiler, a pair of relatively fiat hollow water heating andcirculating elements disposed in the firebox and each extendingdownwardly and inwardly from an associated side sheet, means providingan intake for boiler water from the barrel of the boiler connected tothe inner rear end portion of each element and other means providing anoutlet for the outer front end portion of each element and openingthrough one of the sheets of the firebox and discharging into adjacentboiler water space.

2. A locomotive boiler construction e1nbodying therein, a barrel and afirebox having sheets forming parts of the front, rear and side waterlegs of the boiler, a pair of rela tively flat hollow water heating andcirculating elements disposed in the firebox and each extendingdownwardly and inwardly from an associated side sheet, means providingan intake for boiler water from the barrel of the boiler connected tothe inner rear end ortion of each element and other means provi ing anoutlet for the outer front end portion of each element and risingtherefrom and opening through the crown sheet of the firebox into thewater space above the same.

3. A locomotive boiler construction embodying therein a barrel and afirebox having a crown sheet, a pair of relatively flat hollow waterheating and circulating elements disposed in the firebox and eachextending downwardly and inwardly therefrom, conduit means connectingthe inner rear end of each element with the barrel of the boiler at apoint forwardly of the front water leg there of and conduit meansconnected to the outer front end of each element and opening throughsaid crown sheet.

4;. A locomotive boiler construction embodying therein a barrel and afirebox having a crown sheet, a pair of relatively flat hollow waterheating and circulating elements disposed in the firebox and eachextending downwardly and inwardly therefrom and each including a fiathollow body open along its bottom rear end and a tubular portion alongits outer top end, a tube secured to the open end of each body andhaving an opening near its rear end in communication with said body,means connecting the forward end of said tubes with said boiler barreland risers each connected at one end to the top front end of eachelement and to the crown sheet of the firebox respectively.

In testimony whereof, I have hereunto set my hand, this 31st day of May,1928.

ARTHUR WM. NELSON.

